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Unified Diff: lib/src/intersection_selector.dart

Issue 1712793002: Add the content of the package. (Closed) Base URL: git@github.com:dart-lang/boolean_selector@master
Patch Set: Created 4 years, 10 months ago
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Index: lib/src/intersection_selector.dart
diff --git a/lib/src/intersection_selector.dart b/lib/src/intersection_selector.dart
new file mode 100644
index 0000000000000000000000000000000000000000..aa51bf94bb2d31f5cacf0fe8dbacaa8392b3f2bf
--- /dev/null
+++ b/lib/src/intersection_selector.dart
@@ -0,0 +1,35 @@
+// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../boolean_selector.dart';
+import 'union_selector.dart';
+
+/// A selector that matches inputs that both of its sub-selectors match.
+class IntersectionSelector implements BooleanSelector {
+ final BooleanSelector _selector1;
+ final BooleanSelector _selector2;
+
+ Iterable<String> get variables sync* {
+ yield* _selector1.variables;
+ yield* _selector2.variables;
+ }
+
+ IntersectionSelector(this._selector1, this._selector2);
+
+ bool evaluate(semantics) =>
+ _selector1.evaluate(semantics) && _selector2.evaluate(semantics);
+
+ BooleanSelector intersection(BooleanSelector other) =>
+ new IntersectionSelector(this, other);
+
+ BooleanSelector union(BooleanSelector other) =>
+ new UnionSelector(this, other);
+
+ void validate(bool isDefined(String variable)) {
+ _selector1.validate(isDefined);
+ _selector2.validate(isDefined);
+ }
+
+ String toString() => "($_selector1) && ($_selector2)";
+}
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